Inspecting the zeros of a polynomial, a teen wonders why its plot resembles the
graphs of its constituent terms, but with the signs reversed. Doctor Peterson explains
the contrary curves with numerical approximation; Doctor Greenie, with a logical
extension.

A student wonders if there is an equation for a rectangle in the Cartesian plane,
comparable to the one for the equation of a circle. Doctor Peterson confirms the student's
suspicions about the difficulties involved.